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I know that diameter for seatpost clamp for tarmac would be 32.6mm but the offer for this part is very limited(only carbon ti has them I guess) so I would like to ask if anyone is using 31.8mm seatpost clamp and if works fine as well

I asked a similar question a while back and didn't get too many positive responses. The Specialized clamp weighs 20g or so which isn't the lightest by a long way but replacing it will only save 10-15g so not sure it's worth the hassle

Feex wrote:I asked a similar question a while back and didn't get too many positive responses. The Specialized clamp weighs 20g or so which isn't the lightest by a long way but replacing it will only save 10-15g so not sure it's worth the hassle

are you sure it weights only 20gr? I have the S works clam of the SL2 and look much more massive than that.

I also ride a S-Works Tarmac (2007). I never found a decent replacement for the stock 32.6 seat clamp. My scale showed 21 grams and I quickly realized that trying to find something to only lose a few grams wasn't worth the money or time. About the only thing I decided to do, if the time and situation came up over the next winter, was to lighten it through drilling or grinding/removing some of the existing material. I could live with bringing it down to under 20 grams and never think about it again...

63corvairsprint wrote:I also ride a S-Works Tarmac (2007). I never found a decent replacement for the stock 32.6 seat clamp. My scale showed 21 grams and I quickly realized that trying to find something to only lose a few grams wasn't worth the money or time. About the only thing I decided to do, if the time and situation came up over the next winter, was to lighten it through drilling or grinding/removing some of the existing material. I could live with bringing it down to under 20 grams and never think about it again...

Good luck on your quest...

carbon ti is decent but pricey.i just think that a 31.8mm clamp would fit anyway.

I am looking forward to hearing from you regarding the outcome on using the 31.8 seat post regarding fit and function. For those of us that are saddled with the 32.6 size requirement, knowing if will work or not will be helpful.

I personally think that if using the 31.8 sized clamps worked acceptably specialized would have used it in some form...

The only way to know for sure it to test the theory and find out... if you can get access to a cheap used 31.8 carbon band style clamp, the investment wouldn't be bad if it didn't work...

Feex wrote:I asked a similar question a while back and didn't get too many positive responses. The Specialized clamp weighs 20g or so which isn't the lightest by a long way but replacing it will only save 10-15g so not sure it's worth the hassle

are you sure it weights only 20gr? I have the S works clam of the SL2 and look much more massive than that.

A seatpost clamp off an SL3 or SL4 would work and be lighter. The clamp on my SL3 has way less material than my SL2. But I haven't weighed the clamps